Right. Entertainment in general is subpar these days. This goes for music of all genres and movies. It's all cookie cutter and recycled junk.
Rap is no different though in that department than any other genre. Rap had tons of good music in the 90s and early to mid 2000s. Rap is also geared to the younger generation. You aren't going to see rappers make much music as they get older. And usually the fanbase grows out of it, too. My uncle was born in 68 and was very into rap when it first started. Loved NWA. But then grew out of it.
I like all genres of music. Rap, older country, funk, blues, hard rock, heavy metal and others. A lot of people are closed minded when it comes to music and have pre-conceived notions about a whole genre based on random songs they hear on the radio or tv. It gives me a chuckle.